Process os stabilizing bisulfites.



UNITED STATES PATENT orincnj EON nonnnir, or BRUSSELS, BELGIUM.

t e-teem it may concern Beitknown that I, LE'ON NoNNE'r, a su'br ject of the King of Belgium, residing at 224 :Rue. ,d u Trone Brussels; in the Kingdom of?! 5 Belg1um, have invented certain new and use-I Improvements in Processes of StabiliZ-" 1ng B sulfites, of, which the following isa specification. aIt'is known that sulfurous acid gas is gen: erallyused as a disinfecting agent and as a ].regulator for fermentation .in the wine and beerindustries. The procedure is generally as follows:-;An' alkali metal bisulfite is 'di's solyed' either inwater or in" the mustand 1n dissolving this hisulfite, liberates sulfurousacid. In-order to effect the complete decomposition'of the'bisulfite and the liberation of all the sulfurousacid contained therein, a bisulfate is used conjointly with the bisulfite. These two salts may be mixed 1 at the time they are used and by suitably proportioning the mixed quantities solutions con- 1 taining. predetermined percentage of sul- .1 furous and and appropriate for'their ultimate use can be obtained. This method, however, necessitates manipulations which it is the'object of the present invention to eliminate, by permitting of the formation of stable mixturesof bisulfite and -bisulfate 3'0 such mixtures being impervious to moisture and capable of being kept for a long time without alteration. To this end both salts are separately prepared in. granulated form and are subsequently mixed in the desired proportions; they maybe kept in a closed vessel, as long as it is desired without any alteration. y The granules of bisulfate of soda or of potash are obtained by" operation (in the 40 known manner) with sulfuric acid on the corresponding neutral sulfate but the treatment has to be effected in such a manner j that the resultant acid sulfate is completely anhydrous and does not contain any excess in sulfuric acid. This melted bisulfate is cast in plates which are very hard and are broken into small fragments or granules; the latter are subsequently rolled in bicarbonate of soda in brder to remove any traces of free sulfuric acid from their surfaces.

. In order to obtain granules of bisulfite capable of being kept without alteration, 1n contact with granules of bisulfate, the bisulfite is mixed with an equal quantity of thio- I Specification of Iietters Patent. Application ma istiaieQfseri i No. 773,513

RROCESS OF STABILIZING BISULFITES.

PatentedFeb.17,1914.

. s ulfate of soda melted in its water of crys- .-tall1zat 1on. -This mixture when east and icooled 1s a hard substance capable ofbeing pulverized and, impervious to moisture,

closed vessel without their intimate contact producing a double decomposition.

7 To better insure the stability'of the bisulfite, the hyposulfite, with which it is mixed, may have a small quantit'y of gum arabic added thereto, the effect of which being well known. This addition,"however,is optional. As the volume of the sulfurous gas liberated when the mixture of. granules is dissolved in water, is always proportional to the quantity of salts used, it is easyto obtain solutions containing a predetermined'percentage. The grains may be colored, withoutbeing'afi'ected thereby, with a trace of trinitrophenol or methylene blue.

, What I claim and desire to secure by Letters Patent of the United States is 1. A method. of obtaining granules of bisulfite capable of being. kept without alteration in contact with granules of bisulfate, wherein the bisulfite is mixed with an alkali metal thiosulfate melted in its water of crystallization and the mixture is cast in a hard mass which is transformed into granules.

2. A method of obtaining granules of bisulfite capable of being kept without alteration in contact with granules of bisulfate, wherein the bisulfite is mixed with thiosulfate of soda melted in its water crystallization and the mixture cast ina hard mass which is transformed into granules.

3. A method of obtaining granules of hisulfite capable of being kept without alteration in contact with granules of bisulfate, wherein the bisulfite is mixed with thiosulfate of soda meltedv in its water ofcrystallization and having a small quantity of um arabic added thereto and the mixture LEON NONNET.

Witnesses ADoLPHn VoeEL,

Leon Prr'nmxn.

which isthen broken into small fragments The granules of the two salts 

